While images of the structure have not been revealed yet, their spokeswoman described it similar to a tennis bubble seen in the image below.

[The theaters have] inflatable exterior walls and come with full seating for an audience of about 450 people…the interior walls and ceiling come acoustically treated to ensure the sound quality of a normal IMAX film. Portable theaters will help IMAX tap into Chinese cities that sometimes have millions of residents but insufficient infrastructure for a standard theater.